Steam-engine valve



(No Model.)

J. H. WILLIAMS. STEAM ENGINE VAL E.

No. 409,720. r Patented Au 27, 1889.

WITNESSES IJVV'ENTOR UNITED STATES PATENT OFFICE. 7

JOHN H. WILLIAMS, OF URBANA, ()I-IIO.

STEAM-ENGINE VALVE.

SPECIFICATION forming part of Letters Patent No. 409,720, dated August 27, 1889.

Original application filed June 9, 1888, Serial No. 260,236. Divided and this application filed October 1, 1888. Serial No. 286,903. (No model.)

To whom it may concern.-

Be it known that I, JOHN H. WILLIAMS, a citizen of the United States, residing at Urbana, inthe county of Champaign and State of Ohio, have invented certain new and useful Improvements in Steam-Engine Valves, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to certain new and useful improvements in steam-engines.

My improvements relate to the manner of constructing the steam-ports of a cylinder, whereby the area of the cross-section of the ports shall not in any part thereof be less than the mouth or end of the port which opens into the steam-chest,as will be hereinafter more fully pointed out.

The present application is a division of an application filed by me on the 9th of June, 1888, Serial No. 260,236, for improvements in steam-engine valves.

In the accompanying drawings, forming a part of this specification, and on which like reference-letters indicate corresponding parts, Figure 1 is a horizontal sectional view of the engine-cylinder; Fig. 2, an end elevation of a part of the cylinder, the steam-chest, and adjacent parts; Fig. 3, a detail enlarged view of the steam-chest and valve, showing the latter in different positions with respect to the ports.

I have illustrated a steam-engine cylinder of the ordinary or any approved type, with my improvements embodied therein.

The valve-seat is composed of a fiat surface L, which is the face of the boss or usual onlargement cast on the side of the cylinder.

The valve -casing consists of an annular frame or body M, bolted or otherwise secured upon the face L, and provided with a cap 0, also secured by bolts or otherwise.

The live steam is introduced into and the dead steam is exhausted from the valve-chest by means of pipes P and Q, which connect with the openings at the sides of the boss, and communicate with the interior of the chest by extending through the surface L. This construction admits of the removal of the cap of the steam -chest without disconnecting the steam-pipes in case of a desire to have access to the interior of the chest, as is frequently the case, to supply new packing, for instance.

Referring now to Fig. 3, it will be seen that the mouths of the engine-ports at the ends which open into the steam-chest are substantially the shape and but slightly smaller than the arms of the valve, which, in conjunction with the remaining portion of these ports, presently to be described, affords material advantages in the practical operation of the engine. The shape of the remaining portion of the ports, as shown in Figs. 3 and 4, consists in gradually widening the ports from the inner ends of the months within the steam-chest until the width of the outer ends of the ports occupies a considerable portion of the circumference of the cylinder. The result of this form is that the smallest area of the port between the outer end of the mouth and the outer end of the port is equal to the area of the mouth, whereby, when the whole length of the mouth is opened by a movement of the valve, the inlet and outlet of the steam are perfectly free and exceptionally quick and direct; or, in other words, the valve opens the mouths of the ports throughout, and the entire length of the mouths, and the ports proper, by reason of the characteristics above mentioned, coact with the months in the rapid admission and emission of the steam.

The steam-ports may be made 011 a curve in cross-section, or may be made straight in crosssection, as shown, the latter form being preferred in the smaller engines.

The letter R refers to the valve, which is equal in length to the diameter of the steamchest, and equal in thickness to the space between the inner face of the cap and the surface L. It is mounted upon a shaft S, which has hearings in the cap and at T. This shaft is provided with a crank U. If desired, the valve may be packed in the manner set out in my application above alluded to, or in any other convenient manner. It divides the steam-chest diametrically and oscillates across the port-mouths, so as to open them alternately to communication between the inlet-pipe and the exhaust-pipe Q.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

The combination, with an oscillating valve consisting of a central portion and two arms converging in width toward the center, a shaft on which it oscillates, a crank on the shaft, a steam-chest composed in part of an annular body and a cap-plate, and inlet and exhaust pipes which communicate with the steamchest at the opposite sides of the valve, of a steam-cylinder whose boss composes the remainder of said chest and which is constructed with steam-ports which occupy a portion of its circumference at their outer ends and 0011- I 5 verge to points within said chest, and mouths of the same shape and slightly smaller than the arms 'of the valve.

In testimony whereof I aflix my signature in presence of two Witnesses.

JOHN H. WILLIAMS. Vitnesses:

WV. F. KING, 0. T. JAMIESON. 

